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Observation of the Resonant Character of the Z(4430)[superscript −] State

Author(s)
Counts, Ian Thomas Hunt; Williams, Michael; Ilten, Philip J
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Abstract
Resonant structures in B[superscript 0] → ψ[superscript ′]π[superscript −]K[superscript +] decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3  fb[superscript −1] collected with the LHCb detector. The data cannot be described with K[superscript +]π[superscript −] resonances alone, which is confirmed with a model-independent approach. A highly significant Z(4430)[superscript −] → ψ[superscript ′]π[superscript −] component is required, thus confirming the existence of this state. The observed evolution of the Z(4430)[superscript −] amplitude with the ψ[superscript ′]π[superscript −] mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin parity is determined unambiguously to be 1[superscript +].
Date issued
2014-06
URI
http://hdl.handle.net/1721.1/90891
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, et al. “Observation of the Resonant Character of the Z(4430)[superscript −] State.” Physical Review Letters 112, no. 22 (June 2014). © 2014 CERN, for the LHCb Collaboration
Version: Final published version
ISSN
0031-9007
1079-7114

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